## entropy equations

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Teresa Chan 2G
Posts: 9
Joined: Wed Sep 21, 2016 2:57 pm

### entropy equations

In class we talked about how $\Delta S= k_b ln\frac{W_2}{W_1} = k_b ln\frac{V_2}{V_1}$

does that mean W = V, and why is that?

AndrewM2G
Posts: 9
Joined: Fri Jul 22, 2016 3:00 am

### Re: entropy equations

I don't think it means volume is equal to work, but work is measured in the change in the volume of a system (the work done by the system or the work done to a system). I believe it is related to the relation q=-w, which is equal to nRT ln V2/V1. I believe thats how the W2/W1 becomes the V2/V1 in the equation.

Teresa Chan 2G
Posts: 9
Joined: Wed Sep 21, 2016 2:57 pm

### Re: entropy equations

But I don't think W is work? It's the W for degeneracy I believe

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: entropy equations

Hey Teresa!

W is the degeneracy. Degeneracy identifies how many different configurations there are that have the same energy.

Therefore, you can imagine that if I double the volume of a gas I double the amount of configurations the molecules could obtain.